Error! Check Activation

The suggestion Nanaky made worked. The step about "suggested branch" didn't seem to exist in Windows 10 so I skipped it and it still worked fine. Thanks!

I also get the Error:  Check Activation message.  I tried to use your directions to correct the problem.  On #7, I assume I am supposed to enter HKEY_CURRENT_USER for the backup registry key.  It's not clear.  I tried that, and I hit save.  It says right click the adept key.  I saw no adept key.  Can you help?

Windows:

    Close all applications.

    Choose Start > Run.

    In the Open text box, type regedit and then press Enter. The Registry Editor opens.

    In the left pane of the Registry Editor, locate the following registry key: HKEY_CURRENT_USER\Software\Adobe\Adept

    Select the Adept key.

    Choose File > Export.

    In the Export Registry File dialog box, select Selected Branch under Export Range. Enter a name and location for the backup registry key, and then click Save.

    Right-click the Adept key and choose Delete.

    In the Confirm Key Delete dialog, click OK.

    Close the Registry Editor.

    Open Adobe Digital Editions and reauthorize.

Macintosh:

    quit Adobe Digital Editions.

    Navigate to /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash.

    If you are using 10.7, see https://helpx.adobe.com/x-productkb/global/access-hidden-user-library-files.html

    Open Adobe Digital Editions and reauthorize.